Ask HN: What field should I work in so as to help people?

I will be graduating from university in a year with a bachelor of science in Computer Science and minor in Math. When I started school I didn't really think about a deeper purpose to my work. I enjoy computer science and am good at i, but that's about it. It seems everywhere my peers are going to work are not places that are really helping people. Most of them are in it for the money.

So my question is: in what field should I work that is going to make a difference in people's lives? Especially disenfranchised persons.